Answer:
Spies and detectives do this to phones and musical shoes make this sound.
Doing this with your job can be risky but doing it with smoking is always a good idea
With sharp edged wit and pointed poise. It can settle disputes without making a noise.
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
A gentleman whose offspring have successfully produced offspring of their own.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?